1621775802099 has 8 divisors (see below), whose sum is σ = 2197816387792. Its totient is φ = 1063459542240.

The previous prime is 1621775802091. The next prime is 1621775802139. The reversal of 1621775802099 is 9902085771261.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1621775802099 - 2³ = 1621775802091 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1621775802091) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4431081244 + ... + 4431081609.

It is an arithmetic number, because the mean of its divisors is an integer number (274727048474).

Almost surely, 2^{1621775802099} is an apocalyptic number.

1621775802099 is a deficient number, since it is larger than the sum of its proper divisors (576040585693).

1621775802099 is an equidigital number, since it uses as much as digits as its factorization.

1621775802099 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8862162917.

The product of its (nonzero) digits is 3810240, while the sum is 57.

The spelling of 1621775802099 in words is "one trillion, six hundred twenty-one billion, seven hundred seventy-five million, eight hundred two thousand, ninety-nine".